Method for preparing spectrally pure magnesium oxide
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A magnesium oxide and spectrally pure technology, applied in the direction of magnesium oxide, etc., can solve the problems of high-end technology, high impurities, and low purity of magnesium oxide, and achieve the effect of easy control of operation steps, low impurity content, and high purity
Inactive Publication Date: 2012-12-05
TIANJIN CHEM REAGENT RES INST
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[0003] At present, the commonly used method is to place magnesium hydroxide in the disk into a thin layer as much as possible, place it in the center of the quartz heating tube, and heat it to 85°C with an electric furnace to obtain magnesium oxide. The magnesium oxide produced by this method has low purity and no impurities. High, can only meet the rubber and oil industry, can not meet the needs of high-end technology
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Embodiment 1
[0020] A preparation method of spectrally pure magnesium oxide, the method is as follows:
[0021] (1) Metal magnesium powder reacts with nitric acid
[0022] Put 1 kg of metal magnesium powder in a small white porcelain jar, slowly add high-purity dilute nitric acid dropwise, add some distilled water during the reaction, and control the reaction temperature at 75°C. When ph=8, stop adding acid and let stand After 10 minutes, filter, pour the filtrate into a small white porcelain jar, and then add 20 ml of 30% H 2 o 2 , left standing overnight, the filtrate is adjusted to 6 with a small amount of high-purity nitric acid to obtain filtrate A, and magnesium nitrate is obtained;
[0023] (2) Synthetic spectrum magnesium oxide
[0024] Prepare a saturated solution of 130g of high-purity oxalic acid, and slowly add the oxalic acid solution to the liquid A prepared in step (1) under the condition of constant stirring. At this time, a large amount of white precipitate appears. He...
Embodiment 2
[0029] A preparation method of spectrally pure magnesium oxide, the method is as follows:
[0030] (1) Metal magnesium powder reacts with nitric acid
[0031] Put 1.2 kg of metal magnesium powder in a small white porcelain jar, slowly add high-purity dilute nitric acid dropwise, add some distilled water during the reaction, and control the reaction temperature at 80 ° C. When ph = 8.5, stop adding acid and wait Set aside for 15 minutes, filter, pour the filtrate into a small white porcelain jar, and then add 25 ml of 30% H 2 o 2 , left standing overnight, the filtrate is adjusted to 6.5 with a small amount of high-purity nitric acid to obtain filtrate A, and magnesium nitrate is obtained;
[0032] (2) Synthetic spectrum magnesium oxide
[0033] Prepare a saturated solution with 120g of high-purity oxalic acid, and slowly add the oxalic acid solution to the liquid A prepared in step (1) under the condition of constant stirring, a large amount of white precipitate appears, af...
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Abstract
The invention relates to a method for preparing spectrally pure magnesium oxide. The preparation method comprises the following steps of: reacting metal magnesium powder with nitric acid, namely putting the magnesium powder into a small white porcelain pot, dripping high-purity diluted nitric acid into the pot, then adding H2O2 into the pot, and filtering the mixture to obtain filtrate A so as toobtain magnesium nitrate; and preparing saturated solution from high-purity oxalic acid, slowly adding the oxalic acid solution into the filtrate A to generate a large amount of white sediment, and heating and cooling the sediment to separate out the spectrally pure magnesium oxide. According to the preparation method, the metal magnesium powder is reacted with the nitric acid to prepare the magnesium nitrate, the prepared magnesium nitrate is reacted with the high-strength oxalic acid to generate magnesium oxalate, and the magnesium oxalate is dried at a high temperature to form the spectrally pure magnesium oxide. The preparation method has the advantages of simple processes, easy control of operation steps, advanced technology and high production efficiency; and the prepared spectrallypure magnesium oxide product has high purity and low impurity content, and the prepared magnesium oxide meets the requirement of high-end technology of the electronic industry.
Description
technical field [0001] The invention belongs to the field of preparation methods of inorganic compounds, in particular to a preparation method of spectrally pure magnesium oxide. Background technique [0002] Spectrum pure magnesium oxide is widely used in the electronic industry to configure silicon single wafer grinding materials. It has good adsorption and low melting point, and can change the metal lattice structure to make it finer. Therefore, it is often used in paint coatings, refractory bricks, Magnetic materials, ceramics, rubber tires, etc. [0003] At present, the commonly used method is to place magnesium hydroxide in the disk into a thin layer as much as possible, place it in the center of the quartz heating tube, and heat it to 85°C with an electric furnace to obtain magnesium oxide. The magnesium oxide produced by this method has low purity and no impurities. High, can only meet the rubber and oil industry, can not meet the needs of high-end technology. [0...
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